Compilare: main.cpp: In instantiation of 'bool hashtable<Tkey, Tinfo>::check(unsigned int) [with Tkey = int; Tinfo = bool]': main.cpp:200:28: required from here main.cpp:143:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (container[pointer].key==target and !occupied[pointer]) ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~ main.cpp:145:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if ((container[pointer].key==target and occupied[pointer]) or container[pointer].key==0) ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~